You can always resubmit a card if you think it was misgraded (obviously if it was undergraded). You can break it out and send it raw, or just resubmit the slab and ask them to give it another look. Usually if you do the latter the grader will have a bit of a bias; if you wait awhile and send it back raw he may not even remember it. It's done all the time, for better or worse.
But I don't think collectors would like the idea of having invisible ink put on the back of their cards. That just wouldn't go over well.
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